B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/95
B23K 11/10 (2006.01) B23K 9/235 (2006.01) B23K 11/34 (2006.01) B23K 35/22 (2006.01)
Patent
CA 1098969
OP-6013 METHOD OF JOINING TWO SHEET METAL PARTS Abstract of the Disclosure A method of joining first and second sheet metal parts along a common seam formed by a first surface on the first part and a second surface on the second part. The surfaces are in abutting relationship at the seam and have a corrosion resistance layer therebetween. In accordance with this method, there is provided a thixotropic, non-hardening, corrosion resistant material including a solvent and having negligible gravity flow at temperatures less than about 400°F to 440°F and forming a heat insulating, coherent gel when the solvent. is burnt. In accordance with this method, a layer of the ma- terial of at least about 6-10 mils is applied over the first surface, the first and second surfaces are then clamped to- gether to form the common seam, spot welding electrodes are then placed on opposite sides of the seam to engage the clamped metal parts at a weld zone extending through the parts. Thereafter, the electrodes are forced together at a selected pressure. This forcing step is continued until the corrosion resistant material is squeezed from the welded zone to a thick- ness less than about 1 mil. Thereafter, a welding current of- a selected amperage is passed between the electrodes for a weld time sufficient to melt the metal of the two parts at the surfaces and in the weld zone while continuing the afore- mentioned forcing step. After the melting, current is dis- continued and the forcing step is continued for a time sufficient to allow solidification of the melted metal of the parts in the weld zone. In this manner, spot welding is accomplished between the two parts separated by a corrosion resistant layer, except in the nugget of the weld.
294484
Featherstone Harry E.
Sniff Walter G.
Gowling Lafleur Henderson Llp
Orrville Products Inc.
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